/Engine/Plugins/2D/Paper2D/Source/Paper2D/Classes/PaperTileSet.h
Returns the terrain type this tile is a member of, or INDEX_NONE if it is not part of a terrain.
int32 GetTerrainMembership ( const [FPaperTileInfo](API\Plugins\Paper2D\FPaperTileInfo) & TileInfo ) const